FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/truespeech.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 181 186 97.3%
Branches: 69 72 95.8%

Line Branch Exec Source
1 /*
2 * DSP Group TrueSpeech compatible decoder
3 * Copyright (c) 2005 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/mem_internal.h"
25
26 #include "avcodec.h"
27 #include "bswapdsp.h"
28 #include "get_bits.h"
29 #include "internal.h"
30
31 #include "truespeech_data.h"
32 /**
33 * @file
34 * TrueSpeech decoder.
35 */
36
37 /**
38 * TrueSpeech decoder context
39 */
40 typedef struct TSContext {
41 BswapDSPContext bdsp;
42 /* input data */
43 DECLARE_ALIGNED(16, uint8_t, buffer)[32];
44 int16_t vector[8]; ///< input vector: 5/5/4/4/4/3/3/3
45 int offset1[2]; ///< 8-bit value, used in one copying offset
46 int offset2[4]; ///< 7-bit value, encodes offsets for copying and for two-point filter
47 int pulseoff[4]; ///< 4-bit offset of pulse values block
48 int pulsepos[4]; ///< 27-bit variable, encodes 7 pulse positions
49 int pulseval[4]; ///< 7x2-bit pulse values
50 int flag; ///< 1-bit flag, shows how to choose filters
51 /* temporary data */
52 int filtbuf[146]; // some big vector used for storing filters
53 int prevfilt[8]; // filter from previous frame
54 int16_t tmp1[8]; // coefficients for adding to out
55 int16_t tmp2[8]; // coefficients for adding to out
56 int16_t tmp3[8]; // coefficients for adding to out
57 int16_t cvector[8]; // correlated input vector
58 int filtval; // gain value for one function
59 int16_t newvec[60]; // tmp vector
60 int16_t filters[32]; // filters for every subframe
61 } TSContext;
62
63 2 static av_cold int truespeech_decode_init(AVCodecContext * avctx)
64 {
65 2 TSContext *c = avctx->priv_data;
66
67
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
2 if (avctx->channels != 1) {
68 avpriv_request_sample(avctx, "Channel count %d", avctx->channels);
69 return AVERROR_PATCHWELCOME;
70 }
71
72 2 avctx->channel_layout = AV_CH_LAYOUT_MONO;
73 2 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
74
75 2 ff_bswapdsp_init(&c->bdsp);
76
77 2 return 0;
78 }
79
80 1442 static void truespeech_read_frame(TSContext *dec, const uint8_t *input)
81 {
82 GetBitContext gb;
83
84 1442 dec->bdsp.bswap_buf((uint32_t *) dec->buffer, (const uint32_t *) input, 8);
85 1442 init_get_bits(&gb, dec->buffer, 32 * 8);
86
87 1442 dec->vector[7] = ts_codebook[7][get_bits(&gb, 3)];
88 1442 dec->vector[6] = ts_codebook[6][get_bits(&gb, 3)];
89 1442 dec->vector[5] = ts_codebook[5][get_bits(&gb, 3)];
90 1442 dec->vector[4] = ts_codebook[4][get_bits(&gb, 4)];
91 1442 dec->vector[3] = ts_codebook[3][get_bits(&gb, 4)];
92 1442 dec->vector[2] = ts_codebook[2][get_bits(&gb, 4)];
93 1442 dec->vector[1] = ts_codebook[1][get_bits(&gb, 5)];
94 1442 dec->vector[0] = ts_codebook[0][get_bits(&gb, 5)];
95 1442 dec->flag = get_bits1(&gb);
96
97 1442 dec->offset1[0] = get_bits(&gb, 4) << 4;
98 1442 dec->offset2[3] = get_bits(&gb, 7);
99 1442 dec->offset2[2] = get_bits(&gb, 7);
100 1442 dec->offset2[1] = get_bits(&gb, 7);
101 1442 dec->offset2[0] = get_bits(&gb, 7);
102
103 1442 dec->offset1[1] = get_bits(&gb, 4);
104 1442 dec->pulseval[1] = get_bits(&gb, 14);
105 1442 dec->pulseval[0] = get_bits(&gb, 14);
106
107 1442 dec->offset1[1] |= get_bits(&gb, 4) << 4;
108 1442 dec->pulseval[3] = get_bits(&gb, 14);
109 1442 dec->pulseval[2] = get_bits(&gb, 14);
110
111 1442 dec->offset1[0] |= get_bits1(&gb);
112 1442 dec->pulsepos[0] = get_bits_long(&gb, 27);
113 1442 dec->pulseoff[0] = get_bits(&gb, 4);
114
115 1442 dec->offset1[0] |= get_bits1(&gb) << 1;
116 1442 dec->pulsepos[1] = get_bits_long(&gb, 27);
117 1442 dec->pulseoff[1] = get_bits(&gb, 4);
118
119 1442 dec->offset1[0] |= get_bits1(&gb) << 2;
120 1442 dec->pulsepos[2] = get_bits_long(&gb, 27);
121 1442 dec->pulseoff[2] = get_bits(&gb, 4);
122
123 1442 dec->offset1[0] |= get_bits1(&gb) << 3;
124 1442 dec->pulsepos[3] = get_bits_long(&gb, 27);
125 1442 dec->pulseoff[3] = get_bits(&gb, 4);
126 1442 }
127
128 1442 static void truespeech_correlate_filter(TSContext *dec)
129 {
130 int16_t tmp[8];
131 int i, j;
132
133
2/2
✓ Branch 0 taken 11536 times.
✓ Branch 1 taken 1442 times.
12978 for(i = 0; i < 8; i++){
134
2/2
✓ Branch 0 taken 10094 times.
✓ Branch 1 taken 1442 times.
11536 if(i > 0){
135 10094 memcpy(tmp, dec->cvector, i * sizeof(*tmp));
136
2/2
✓ Branch 0 taken 40376 times.
✓ Branch 1 taken 10094 times.
50470 for(j = 0; j < i; j++)
137 40376 dec->cvector[j] += (tmp[i - j - 1] * dec->vector[i] + 0x4000) >> 15;
138 }
139 11536 dec->cvector[i] = (8 - dec->vector[i]) >> 3;
140 }
141
2/2
✓ Branch 0 taken 11536 times.
✓ Branch 1 taken 1442 times.
12978 for(i = 0; i < 8; i++)
142 11536 dec->cvector[i] = (dec->cvector[i] * ts_decay_994_1000[i]) >> 15;
143
144 1442 dec->filtval = dec->vector[0];
145 1442 }
146
147 1442 static void truespeech_filters_merge(TSContext *dec)
148 {
149 int i;
150
151
2/2
✓ Branch 0 taken 11 times.
✓ Branch 1 taken 1431 times.
1442 if(!dec->flag){
152
2/2
✓ Branch 0 taken 88 times.
✓ Branch 1 taken 11 times.
99 for(i = 0; i < 8; i++){
153 88 dec->filters[i + 0] = dec->prevfilt[i];
154 88 dec->filters[i + 8] = dec->prevfilt[i];
155 }
156 }else{
157
2/2
✓ Branch 0 taken 11448 times.
✓ Branch 1 taken 1431 times.
12879 for(i = 0; i < 8; i++){
158 11448 dec->filters[i + 0]=(dec->cvector[i] * 21846 + dec->prevfilt[i] * 10923 + 16384) >> 15;
159 11448 dec->filters[i + 8]=(dec->cvector[i] * 10923 + dec->prevfilt[i] * 21846 + 16384) >> 15;
160 }
161 }
162
2/2
✓ Branch 0 taken 11536 times.
✓ Branch 1 taken 1442 times.
12978 for(i = 0; i < 8; i++){
163 11536 dec->filters[i + 16] = dec->cvector[i];
164 11536 dec->filters[i + 24] = dec->cvector[i];
165 }
166 1442 }
167
168 5768 static void truespeech_apply_twopoint_filter(TSContext *dec, int quart)
169 {
170 int16_t tmp[146 + 60], *ptr0, *ptr1;
171 const int16_t *filter;
172 int i, t, off;
173
174 5768 t = dec->offset2[quart];
175
2/2
✓ Branch 0 taken 358 times.
✓ Branch 1 taken 5410 times.
5768 if(t == 127){
176 358 memset(dec->newvec, 0, 60 * sizeof(*dec->newvec));
177 358 return;
178 }
179
2/2
✓ Branch 0 taken 789860 times.
✓ Branch 1 taken 5410 times.
795270 for(i = 0; i < 146; i++)
180 789860 tmp[i] = dec->filtbuf[i];
181 5410 off = (t / 25) + dec->offset1[quart >> 1] + 18;
182 5410 off = av_clip(off, 0, 145);
183 5410 ptr0 = tmp + 145 - off;
184 5410 ptr1 = tmp + 146;
185 5410 filter = ts_order2_coeffs + (t % 25) * 2;
186
2/2
✓ Branch 0 taken 324600 times.
✓ Branch 1 taken 5410 times.
330010 for(i = 0; i < 60; i++){
187 324600 t = (ptr0[0] * filter[0] + ptr0[1] * filter[1] + 0x2000) >> 14;
188 324600 ptr0++;
189 324600 dec->newvec[i] = t;
190 324600 ptr1[i] = t;
191 }
192 }
193
194 5768 static void truespeech_place_pulses(TSContext *dec, int16_t *out, int quart)
195 {
196 int16_t tmp[7];
197 int i, j, t;
198 const int16_t *ptr1;
199 int16_t *ptr2;
200 int coef;
201
202 5768 memset(out, 0, 60 * sizeof(*out));
203
2/2
✓ Branch 0 taken 40376 times.
✓ Branch 1 taken 5768 times.
46144 for(i = 0; i < 7; i++) {
204 40376 t = dec->pulseval[quart] & 3;
205 40376 dec->pulseval[quart] >>= 2;
206 40376 tmp[6 - i] = ts_pulse_scales[dec->pulseoff[quart] * 4 + t];
207 }
208
209 5768 coef = dec->pulsepos[quart] >> 15;
210 5768 ptr1 = ts_pulse_values + 30;
211 5768 ptr2 = tmp;
212
4/4
✓ Branch 0 taken 135547 times.
✓ Branch 1 taken 591 times.
✓ Branch 2 taken 130370 times.
✓ Branch 3 taken 5177 times.
136138 for(i = 0, j = 3; (i < 30) && (j > 0); i++){
213 130370 t = *ptr1++;
214
2/2
✓ Branch 0 taken 113066 times.
✓ Branch 1 taken 17304 times.
130370 if(coef >= t)
215 113066 coef -= t;
216 else{
217 17304 out[i] = *ptr2++;
218 17304 ptr1 += 30;
219 17304 j--;
220 }
221 }
222 5768 coef = dec->pulsepos[quart] & 0x7FFF;
223 5768 ptr1 = ts_pulse_values;
224
4/4
✓ Branch 0 taken 141217 times.
✓ Branch 1 taken 180 times.
✓ Branch 2 taken 135629 times.
✓ Branch 3 taken 5588 times.
141397 for(i = 30, j = 4; (i < 60) && (j > 0); i++){
225 135629 t = *ptr1++;
226
2/2
✓ Branch 0 taken 112557 times.
✓ Branch 1 taken 23072 times.
135629 if(coef >= t)
227 112557 coef -= t;
228 else{
229 23072 out[i] = *ptr2++;
230 23072 ptr1 += 30;
231 23072 j--;
232 }
233 }
234
235 5768 }
236
237 5768 static void truespeech_update_filters(TSContext *dec, int16_t *out, int quart)
238 {
239 int i;
240
241 5768 memmove(dec->filtbuf, &dec->filtbuf[60], 86 * sizeof(*dec->filtbuf));
242
2/2
✓ Branch 0 taken 346080 times.
✓ Branch 1 taken 5768 times.
351848 for(i = 0; i < 60; i++){
243 346080 dec->filtbuf[i + 86] = out[i] + dec->newvec[i] - (dec->newvec[i] >> 3);
244 346080 out[i] += dec->newvec[i];
245 }
246 5768 }
247
248 5768 static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
249 {
250 int i,k;
251 int t[8];
252 int16_t *ptr0, *ptr1;
253
254 5768 ptr0 = dec->tmp1;
255 5768 ptr1 = dec->filters + quart * 8;
256
2/2
✓ Branch 0 taken 346080 times.
✓ Branch 1 taken 5768 times.
351848 for(i = 0; i < 60; i++){
257 346080 int sum = 0;
258
2/2
✓ Branch 0 taken 2768640 times.
✓ Branch 1 taken 346080 times.
3114720 for(k = 0; k < 8; k++)
259 2768640 sum += ptr0[k] * (unsigned)ptr1[k];
260 346080 sum = out[i] + ((int)(sum + 0x800U) >> 12);
261 346080 out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
262
2/2
✓ Branch 0 taken 2422560 times.
✓ Branch 1 taken 346080 times.
2768640 for(k = 7; k > 0; k--)
263 2422560 ptr0[k] = ptr0[k - 1];
264 346080 ptr0[0] = out[i];
265 }
266
267
2/2
✓ Branch 0 taken 46144 times.
✓ Branch 1 taken 5768 times.
51912 for(i = 0; i < 8; i++)
268 46144 t[i] = (ts_decay_35_64[i] * ptr1[i]) >> 15;
269
270 5768 ptr0 = dec->tmp2;
271
2/2
✓ Branch 0 taken 346080 times.
✓ Branch 1 taken 5768 times.
351848 for(i = 0; i < 60; i++){
272 346080 int sum = 0;
273
2/2
✓ Branch 0 taken 2768640 times.
✓ Branch 1 taken 346080 times.
3114720 for(k = 0; k < 8; k++)
274 2768640 sum += ptr0[k] * t[k];
275
2/2
✓ Branch 0 taken 2422560 times.
✓ Branch 1 taken 346080 times.
2768640 for(k = 7; k > 0; k--)
276 2422560 ptr0[k] = ptr0[k - 1];
277 346080 ptr0[0] = out[i];
278 346080 out[i] += (- sum) >> 12;
279 }
280
281
2/2
✓ Branch 0 taken 46144 times.
✓ Branch 1 taken 5768 times.
51912 for(i = 0; i < 8; i++)
282 46144 t[i] = (ts_decay_3_4[i] * ptr1[i]) >> 15;
283
284 5768 ptr0 = dec->tmp3;
285
2/2
✓ Branch 0 taken 346080 times.
✓ Branch 1 taken 5768 times.
351848 for(i = 0; i < 60; i++){
286 346080 int sum = out[i] * (1 << 12);
287
2/2
✓ Branch 0 taken 2768640 times.
✓ Branch 1 taken 346080 times.
3114720 for(k = 0; k < 8; k++)
288 2768640 sum += ptr0[k] * t[k];
289
2/2
✓ Branch 0 taken 2422560 times.
✓ Branch 1 taken 346080 times.
2768640 for(k = 7; k > 0; k--)
290 2422560 ptr0[k] = ptr0[k - 1];
291 346080 ptr0[0] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
292
293 346080 sum = ((ptr0[1] * (dec->filtval - (dec->filtval >> 2))) >> 4) + sum;
294 346080 sum = sum - (sum >> 3);
295 346080 out[i] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
296 }
297 5768 }
298
299 1442 static void truespeech_save_prevvec(TSContext *c)
300 {
301 int i;
302
303
2/2
✓ Branch 0 taken 11536 times.
✓ Branch 1 taken 1442 times.
12978 for(i = 0; i < 8; i++)
304 11536 c->prevfilt[i] = c->cvector[i];
305 1442 }
306
307 12 static int truespeech_decode_frame(AVCodecContext *avctx, void *data,
308 int *got_frame_ptr, AVPacket *avpkt)
309 {
310 12 AVFrame *frame = data;
311 12 const uint8_t *buf = avpkt->data;
312 12 int buf_size = avpkt->size;
313 12 TSContext *c = avctx->priv_data;
314
315 int i, j;
316 int16_t *samples;
317 int iterations, ret;
318
319 12 iterations = buf_size / 32;
320
321
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 12 times.
12 if (!iterations) {
322 av_log(avctx, AV_LOG_ERROR,
323 "Too small input buffer (%d bytes), need at least 32 bytes\n", buf_size);
324 return -1;
325 }
326
327 /* get output buffer */
328 12 frame->nb_samples = iterations * 240;
329
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 12 times.
12 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
330 return ret;
331 12 samples = (int16_t *)frame->data[0];
332
333 12 memset(samples, 0, iterations * 240 * sizeof(*samples));
334
335
2/2
✓ Branch 0 taken 1442 times.
✓ Branch 1 taken 12 times.
1454 for(j = 0; j < iterations; j++) {
336 1442 truespeech_read_frame(c, buf);
337 1442 buf += 32;
338
339 1442 truespeech_correlate_filter(c);
340 1442 truespeech_filters_merge(c);
341
342
2/2
✓ Branch 0 taken 5768 times.
✓ Branch 1 taken 1442 times.
7210 for(i = 0; i < 4; i++) {
343 5768 truespeech_apply_twopoint_filter(c, i);
344 5768 truespeech_place_pulses (c, samples, i);
345 5768 truespeech_update_filters(c, samples, i);
346 5768 truespeech_synth (c, samples, i);
347 5768 samples += 60;
348 }
349
350 1442 truespeech_save_prevvec(c);
351 }
352
353 12 *got_frame_ptr = 1;
354
355 12 return buf_size;
356 }
357
358 const AVCodec ff_truespeech_decoder = {
359 .name = "truespeech",
360 .long_name = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"),
361 .type = AVMEDIA_TYPE_AUDIO,
362 .id = AV_CODEC_ID_TRUESPEECH,
363 .priv_data_size = sizeof(TSContext),
364 .init = truespeech_decode_init,
365 .decode = truespeech_decode_frame,
366 .capabilities = AV_CODEC_CAP_DR1,
367 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
368 };
369